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CKEditor5 code coverage

Merge pull request #14649 from ckeditor/cf/4984-multi-root-lazy-load

Feature (multi-root-editor): Introduced `MultiRootEditor#loadRoot()` and `EditorConfig.lazyRoots` which can be used to implement roots progressive ("lazy") loading.

Feature (multi-root-editor): Introduced `MultiRootEditor#getRootAttributes()`.

Feature (engine): Introduced `model.Document#getRoots()`.

Fix: Fixed editor crash happening in real-time collaboration when two clients removed and re-attached a root at the same moment.

Fix (undo): Fixed incorrect selection reversion which lead to editor crash in very peculiar scenarios involving adding and removing roots and using undo and redo.

Fix (watchdog): Watchdog now correctly supports multi-root editor after roots were added or detached.

Fix (watchdog): Comments and suggestions data was not correctly restored by Watchdog in non-real-time editing "load and save" integrations.

Other (engine): Introduced `cleanSelection` event in `DowncastDispatcher` for downcast conversion. The event is fired before `selection` events and should be used to do any clean-ups before the model document selection is downcasted.

Other (engine): Prevented document selection conversion if the selection is inside a model root that does not have a corresponding view root. In such case, `selection` downcast event will not be fired.

Other (engine): Renamed `clearAttributes()` converter to `cleanSelection()` converter.

Other (engine): `Schema#getNearestSelectionRange()` will now return `null` for any position inside the graveyard root.

Other (engine): `model.DocumentSelection` will not inherit attributes from nodes inside a graveyard.

Other (core): Commands will now be disabled when the editor has no roots (applies only to commands which state is based on document selection placement).

Other (undo): `UndoCommand#event:revert` will now be fired after all changes triggered by undo are applied (including changes in post-fixer).

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